flake: Add a NixOS flake

pkgs/pubcached.nix

@@ -0,0 +1,25 @@
+{
+  lib
+, python3Packages
+}:
+
+python3Packages.buildPythonApplication {
+  pname = "pubcached";
+  version = "0.1.0";
+
+  src = ./../.;
+ 
+  doCheck = false;
+ 
+  propagatedBuildInputs = with python3Packages; [
+    loguru aiofiles requests falcon toml uvicorn
+  ];
+
+  meta = with lib; {
+    homepage = "https://git.polynom.me/PapaTutuWawa/pubcached";
+    description = "Caching proxy for pub.dev";
+    license = licenses.mit;
+    maintainers = [];
+    platforms = platforms.linux;
+  };
+}